Summary this episode : In the wake of Heather's incident, Lt. Casey is
having a hard time handling his newfound responsibilities. Lt. Severide
is on edge dreading the next attack from the firehouse's arsonist.
Meanwhile, with Renee back from her mother's, Severide knows he has to
confront her about his paternity suspicions. Elsewhere, Mouch begins his
campaign for union president and Shay and Dawson feel that they need to
get out more.

From renowned, Emmy Award-winning executive producer Dick Wolf ("Law
& Order" brand) and creators Derek Haas and Michael Brandt, the
writing team behind "3:10 to Yuma", comes the high-octane drama "Chicago
Fire", - an edge-of-your-seat view into the lives of everyday heroes
committed to one of America's noblest professions. For the firefighters,
rescue squad and paramedics of Chicago Firehouse 51, no occupation is
more stressful or dangerous, yet so rewarding and exhilarating. These
courageous men and women are among the elite who forge headfirst into
danger when everyone else is running the other way and whose actions
make the difference between life and death. The pressure to perform on
such a high level has a way of taking a personal toll, sometimes putting
team members from the Truck and the specially trained Rescue Squad at
odds with each other. Despite any differences, this is an extended
family, and when it's "go time", everyone inside Firehouse 51 knows no
other way than to lay it all on the line for each other. When a tragedy
claims one of their own, there's plenty of guilt and blame to go around.
Lt. Matthew Casey (Jesse Spencer, "House"), in charge of the Truck,
tries to carry on, but butts heads with the brash Lt. Kelly Severide
(Taylor Kinney, "The Vampire Diaries") of the Rescue Squad - and each
blames the other for their fallen team member. Adding to the turmoil,
Casey, unbeknownst to his colleagues, is in the midst of a separation
from Hallie (Teri Reeves, "Three Rivers").